The Midtherm Tee Cap in Black is a purpose built finishing component for HTS Twin Wall flue systems, designed to close off the base of a tee section and protect the chimney from external ingress. Its role is to stop water, debris, and environmental elements from entering the flue, ensuring the system remains clean, efficient, and safe.
Constructed from premium stainless steel with a 0.5mm 316 2B inner layer and a 0.5mm 304 BA outer layer, the cap delivers durability, corrosion resistance, and long-term structural integrity. It is available in both 5-inch and 6-inch diameters, offering straightforward compatibility with common twin wall configurations. The black finish provides a modern, low profile appearance suitable for both contemporary and traditional settings.
Designed as part of the Midtherm HTS high temperature insulated system, the Tee Cap withstands operating temperatures up to 450°C and carries a 4 hour fire rating. Laser welded seams and machine formed joints ensure precise fit and professional appearance. The push fit socket and spigot assembly, used with a locking band, enables fast, secure installation.
Manufactured under ISO 9001 quality systems, CE certified, and produced by a HETAS registered manufacturer, this component supports safe use with wood, multifuel, gas, oil, biomass, and pellet appliances. When installed and maintained correctly, it is protected by a 20 year warranty.
Features and Benefits
- Used to seal the bottom of a tee section on twin wall flue systems
- Stainless steel construction for strength and corrosion resistance
- Available in 5-inch and 6-inch diameters
- High temperature insulated design rated to 450°C
- Laser welded joints for accuracy and clean appearance
- Push fit socket and spigot installation with locking band
- Compatible with wood, gas, oil, biomass, multifuel, and pellet systems
- ISO 9001 manufactured, CE certified, and HETAS registered
- 20 year warranty with registered installation






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